$( x ^ { 4 } - 2 x ^ { 3 } - x$

$\frac{\cot\left(x\right)}{\csc\left(x\right)-1}+\frac{\cot\left(x\right)}{\csc\left(x\right)+1}$

$\left(y+8\right)\left(y+3\right)$

$\sqrt[2]{zx^3}$

$n^2+3n-10=0$

$5\cdot10-3\left(3-8\right)$

$\lim_{x\to-1}\left(\frac{9x^4+9x^3+2x+2}{x+1}\right)$